I did buy the H80i and it was the right decision. The perfect choice because I was able to avoid putting a radiator on the ceiling! Of the case, that is...
On the workbench, the H80i keeps the CPU cores around 32 C. When folding at 100% CPU, temps rise to 52-53 C. The fans are fairly quiet, though on the workbench with the side off, I can hear them since they're right at ear level. It will be interesting to see what the temps are once the case is sealed up and installed in the home office.
The last thing I'm waiting for is for my NZXT Sentry LXE
fan controller to be replaced. This model has a touch-screen that goes on your desk instead of taking up an external drive bay. It has a 6 foot wire from the touch-screen monitor to a small PCI card on the back of the PC. The PCI card does not need an actual motherboard slot so technically it could be mounted/hung from any number of places inside (or outside) the enclosure. It has capacity for up to 5 temp monitors and 5 fans, but at this time I only need to drive 3 big case fans (front, side, and top). I might have 4 temperature probes in there, however. The two H80i push-pull fans will continue to be run off of the H80i Corsair Link interface, since that seems to have been designed pretty well.
Of course, with today's motherboards having goood built-in temperature monitoring and fan control, any fan controller is pretty much a "nice to have" item. For me, I've had problems with motherboard monitoring software in the past, so I've been old-school. Not needing an external bay is also nice because I only have one 5.25" bay free (and it's a 2U unit). The prices have been dropping on these, too. I didn't pay $60+ list price for this one (my price may have been around $40, not sure).
On my first shipment, the touch screen would light up and show all temp and fan statuses correctly and accurately, but would not accept touch input, so I could not adjust the clock or fan speeds.
A long winded explanation, but there it is. I am seeing the light at the end of the tunnel!